Method of and apparatus for recording arterial pulsations



M. (a. CASARE S.

METHOD OFAND APPARATUS FOR RECORDING ARTERIAL PULSATIONS.

APPLICATION HLED JULY25, 1919.

1,41 3,389. A Patented A r; 18, 1922.

. 2 SHEETS-SHEET 1; v

INVENTOR Miguel Gil @asczres ATTORNEY M. G. CASARES. METHOD OF AND APPARATUS FOR RECORDING ARTERIAL PULSATIONS. APPLICATION HLED JULYZS, 19H).

1,413,389. nte Apr. 18, 1922;

2 SHEETS-SHEET 2.

3% fl7 5 elf/mummy I W mm 77% photographic record UNITED) STATES PATENT OFFICE,

MIGUEL GIL CASARES, 0F SANTIAGO, SPAIN.

, METHOD OF AND APPARATUS FOR RECORDING ARTERIAL PULSATIONS.

Application filed July 25,

T 0 all whom it may concern:

Be it known that I, MIGUEL GIL CASARES, a subject of the King of Spain, and a resident of Santiago, Spain, have invented certain new and useful Improvements in Methods of and Apparatus for Recording Arterial Pulsations.

This invention relates to an improved method of and apparatus for recording arterial pulsations, such apparatus being of the class commonly known as sphygmographs, and more especially to an instrument of that character which I have herein designated as a cinephotopalograph, the object of the invention being to provide an instrument by means of which circulation phenomena in different parts of the body. may be simultaneously recorded photographicallyon a single sensitized strip during movement of such strip.

With the. foregoingand other objects in view, which will appear as the description proceeds, the invention consists in the novel features of construction and combination of parts which will be more fully described hereinafterand particularly pointed out in the claims.

In the drawings accompanying and forming part of this specification,

igure 1 is a partly sectional side elevation of the" instrument proper; i

Fig. 2 illustrates in side elevation the funnels and portions of the flexible attaching tubes, one of said funnels. and its tube being shown in section; I

Fig. 3 is a perspective view illustrating the complete instrument; and

Fig. 4 illustrates a development of the produced by the instrument.

The same characters of reference designate the same parts in the difi'erent figures of the drawings.

The method and apparatus herein described are based upon the following two fundamental facts: p

(a) By fitting to the end of a small funnel a flexible tube and placing the opposite end of said tube in communication with a glass tube of small diameter having a portion thereof bent into U-shape and in which asmall quantity of a suitable liquid, such for instance as ether, acetone, or even wa-, ter has been placed, and then carefully applying theropen end of the funnel to certam parts of the body where the pulsations Specification of Lctters Patent.

Patented Apr. 18, 1922.

1919. Serial No. 313,221. g

of the heart and arteries and the movements of the veins may be noted, the pulsative phenomena are freely transmitted to the liquid in the U-shaped tube.

(b) The physical peculiarities presented by the manometrical tube can be recorded by projecting through the use of luminous rays a silhouette of such tube on a sensitized stri Referring to the drawings, 2 designates a supporting base or stand, preferably of wood, towhich is secured a bracket 3 for supporting a source of light, shown herein as an electric lamp 11. Mounted on the base Qwisa stationary cylindrical casing 55, having'a suitable top closure" 7 and provided, in its side wall, with a plurality of vertically alined slits or openings 6, shown herein as three in number, "one" of said slits being shown in full lines and the others in dotted lines in Fig. 1. I I

Within the casing 5, concentric therewith,

is mounted for rotation a second cylinder 8,

the'rotation of which may be produced by a suitable clockwork mounted therein, said clockwork being indicated in a general way at A. The cylinder 8 is adapted to carry on its periphery a strip of sensitized paper or film, any suitable means being provided for holding the film in position on'the cyl inder. Means may also be employed for varying the speed of rotation and for automatically stopping such rotation at the end of a complete revolution.

Supported on the base 2 and the casing .55, are a plurality of transparent tubes 9,

each having a U-shaped portion, one leg 10 of which is in position to close one of the slits 6 in the casing 5, and suitably carried by the bracket 3 in alinement with the legs of the tubes is a source of light, such as an electric lamp 11. Communicating with the outer end of each .of the tubes 9 is a flexible tube 12, carrying at its opposite end a' 5 to expose a portion ofthe film to the light.

The member 14 may be actuated by means of a rod and pin connection with a'pulley or wheel 15, which iii-turn may be rotated by means of a clockwork (not shown) carried within the base 2, and so adjusted that the slide will move in one direction or the other every one-fifth of a second.

From the foregoing, it will be seen that if a small quantity of liquid such as ether is placed in the bent portion of the tubes 9, and the funnels l3.applied to the body of a patient, as hereinbefore referred to, the pulsations will be freely transmitted to the liquid, and if the cylinder 8 carrying the sensitized strip is set in motion, while the light is turned on so as to illuminate the transparent legs 10 of the tubes 9, the strip will receive an impression through the slits 6 in the casing 5. It will be found that each of such impressions comprises three clearly distinct zones, these zones corresponding to the liquid (the part whichis most highly impressioned), the clear border (al menisco) and the air (intermediate impression).

In Fi 4:, I have illustrated a development of the fi m. In this figure, the twolower im pressions, each comprising the zones at, b and 0, represent impressions without pulsation, while the upper impression, comprising the zones d, e and 7, represents an impression made when the funnels are "applied to a pulsating region of a patients body. The white bands 9 between the impressions are the portions of the film protected from the light by the opaque portion of the casing 5 between the ends of adjacent slits 6. The broken line it indicates the impressions made by reason of the periodic movement of the slide 14.

Each of the funnels 13 is provided in its wall with a-sma-llaperture 16, so that when the funnel is appliedto the, body of the patient, any undesirable air compression in thefunnel and tube is avoided. The operator may close these openings .with the tipsof his fingers while forming the impressions, and may uncover the openings before removing the funnelsfrom'the body, so as to avoid the aspiration of theether toward the flexible tu es. 1 a

While'I have described in detail the structure herein illustrated, it is to be understood that I do not thereby limit my invention to the precise features of construction shown, as I am aware that many mechanical changes and modifications may be made therein without departing-from the spirit and scope of the invention asset forth in the appended claims.

Having thus described my invention,what I claim is:

1. In an apparatus for physiological and clinical examination for noting the pulse variations of the circulatory system, the combination of a casing provided with a vertical slit, a rotatable member within said casing and adapted to carry a sensitized strip adjacent to said slit, a U-shaped transparent tube supported outside of said casing and having a leg in position to close said slit, said tube carrying a liquid in the bent portion thereof, a source of light disposed in position to diffuse its rays through said legs and slit and on to said sensitized strip thereby to generate on the strip a reception field containing three distinct impressions corresponding respectively to the liquid in the tube, the meniscus of said liquid and the air in the tube, and a pulsation transmitting tube attached to said U-shaped tube.

2. In an instrument of the class described, the combination of a casing having a plurality of slits therein in vertical alignment,

a rotatable member within said casing adaptstrip thereby to generate on the strip three separate reception fields, each containing three distinct impressions corresponding respectively to the liquid in the tube, themeniscus of said liquid and the air in the tube, and a separate pulsation transmitting tube attached to each of said tubes and adapted to be applied to different portions of a body for recording on said sensitized strip a common' picture of the pulsations at such difier ent portions at the same moment.

In testimony whereof I have signed my name to this specification in the presence of two subscribin witnesses.

T LIIGUEL GIL CASARES.

Witnesses:

; EUMENIO RODRIGUEZ,

MARTIN Bonomzsn. 

